Dove prisms have an unusual and very interesting characteristic —
if you look through the prism and rotate it around a longitudinal
axis, the image rotates through twice the angle through which the
dove prism itself rotates. For optimal peformance, use dove prisms
with collimated light. The top surface of each Dove Prism is ground
and the longest length (specified by dimension B) features an
unbeveled sharp edge.

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